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Leases (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Lessee Lease Description [Line Items] |  |
Operating lease, liability | $ 2,652 |
Operating lease, right-of-use asset | 2,598 |
Rent expense | $ 2,200 | $ 2,600
Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, existence of option to extend | true |
Operating lease minimum term to extend | 1 year |
Operating lease maximum term to extend | 3 years |
Corporate headquarters lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease expiration period | 2020-04 |
Minimum | Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, term of contract | 1 year |
Maximum | Branch network lease agreement |  |
Lessee Lease Description [Line Items] |  |
Operating lease, term of contract | 5 years |

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- Definition Lessee operating lease expiration period. + References No definition available. + Details
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Namespace Prefix: | nick_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee operating lease maximum term to extend. + References No definition available. + Details
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- Definition Lessee operating lease minimum term to extend. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Details
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- Details
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- Details
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- Details
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